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Acted alone?

Watertown Police Chief Edward Deveau said Saturday that the evidence implicating the two suspects in the Boston Marathon bombings suggests they “acted together and alone.”

“From what I know right now, these two acted together and alone,” Deveau told CNN. “I think we have to be ever vigilant, and we’re learning as we go along, but as far as this little cell — this little group — I think we got our guys.”

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Authorities believe Tamerlan Tsarnaev, 26. and his brother Dzhokhar Tsarnaev, 19, are responsible for the blasts. The older brother was killed in an overnight police pursuit Thursday into Friday morning in the Boston suburb of Watertown; the younger brother was captured later Friday.

In 2011, the FBI spoke with the older brother having learned of his ties to radical Islam.

President Barack Obama said in his address to the nation Friday that one of the questions authorities will be looking into is whether the brothers had any help in Monday’s bombings.

“Why did these young men who grew up and studied here as part of our communities and our country resort to such violence? How did they plan and carry out these attacks? And did they receive any help? The families of those killed so senselessly deserve answers,” Obama said Friday.

Deveau told CNN that authorities are still trying to ascertain how the brothers got their weapons and resources.

“We have to figure that out,” Deveau told CNN. “There’s a lot more work to go.”

When asked whether he thinks that the brothers would have launched another attack, Deveau told NBC News on Saturday that his gut instinct is that they would have.

“Oh, you know, I don’t know for sure, but my gut tells me that yes,” Deveau told NBC News. “I mean, if they have another you know, pressure cooker bomb, they weren’t saving that for the Watertown police. They were saving that to try to do another event.”